Raman spectroscopy of the polyanionic copper(II) minerals buttgenbachite and connellite : implications for studies of ancient copper objects and bronzes

Frost, Ray L., Williams, Peter A., Martens, Wayde N., & Kloprogge, J. Theo (2002) Raman spectroscopy of the polyanionic copper(II) minerals buttgenbachite and connellite : implications for studies of ancient copper objects and bronzes. Journal of Raman Spectroscopy, 33(9), pp. 752-757.

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The minerals connellite and buttgenbachite, complex hydroxy sulfate-nitrates of Cu(II), are rare products formed during the corrosion of bronze and brass objects. Infrared and Raman spectra of buttgenbachite and connellite have been obtained at 298 and 77 K using a Raman microprobe in combination with a thermal stage. Raman spectra show the presence of nitrate, sulfate and chloride in the mineral. Spectra of the hydroxyl-stretching region are complex with multiple bands being observed. These observations are in agreement with the structure of the minerals in that the nitrate ion occupies two different sites and that six hydroxyl groups are crystallographically independent. Various OH stretching bands are attributed to independent hydroxyl units in the crystal structure and zeolitic water OH stretching modes. Raman spectroscopy is an excellent technique for the identification of these complex minerals and for the determination of the distribution of anions in their structure.

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ID Code: 5414
Item Type: Journal Article
Refereed: Yes
Keywords: copper, chloride, hydroxyl, nitrate, sulfate, corrosion, artefacts, Raman spectroscopy
DOI: 10.1002/jrs.917
ISSN: 0377-0486
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2002 John Wiley & Sons
Copyright Statement: The definite version is available on publication at www3.interscience.wiley.com
Deposited On: 09 Nov 2006 00:00
Last Modified: 09 Jun 2010 12:35

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